Cut-off valyes



v G. H. REYNOLDS. v METHOD OF OPERATING GUT-OFF VALVES; No. 16,570

Patented Feb, 3, 1857.

UNITED STATES PATENT OFFICE.

GEORGE H. REYNOLDS, OF MEDFORD, MASSACHUSETTS, ASSIGNOR TO G. H. REYNOLDS AND D. B. HINCKLEY.

OPERATING CUT-OFF VALVES OF STEAM-ENGINES.

Specification forming part of Letters Patent No. 16,570, dated February 3, 1857; Reissued October 16, 1866, No. 2,381.

To all whom it may concern:

Be it known that I, GEORGE H. REYNOLDS, of Medford, in the county of Middlesex and State of Massachusetts, have invented a new and Improved Method of Operating Cut-Off Valves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Figure 1 is an elevation of a steam chest and slide valve with my improvements attached. Fig. 2 a horizontal section upon the line A, A, of Fig. 1. Fig. 3 a detached view of one of the slides to be referred to hereafter.

To enable others skilled in the art to understand my invention I will proceed to describe the method in which I have carried it out.

In the said drawings A is the steam chest B an ordinary slide valve with its steam and exhaust ports a, b. O the rod which is operated up and down by the governor and which gives motion to the arms D, D which are hinged to a strap or ring E secured to the governor rod, by which connections, as the motion of the engine is accelerated and the governor balls are elevated, the arms are thrown out toward the ends of the steam chest, and as the motion of the engine is retarded the arms are drawn up toward the center of the chest approaching the position seen in red Fig. 1.

F, F, are balance puppet valves which are secured to the slide valve B and through which the steam passes to the eduction valves a. The stems G of these valves are slotted from beneath and carry the rollers f, f which rest upon the sliding dogs H, H the object and operation of which will now be explained. In Fig. 3 is represented one of these sliding dogs detached it is held to the surface of the slide valve by the straps or guides 9 within which the slide is allowed to move longitudinally independent of the motion of the slide valve. As these slides are moved in the direction of the arrows 2 the puppet valves are opened as at F Fig. 1, the rollers passing up the inclines of the incline when the valve is open, and 7 whenever the slides are slightly moved in a direction contrary to the arrows 2 the rollers fall upon the inclines c and by their weight force back the slides and close the valves whereby an instantaneous cut off is produced at the point desired however slow may be the motion of the slide valve.

The operation is as follows: In the drawings the slide valve is represented as moving in the direction of the arrow 1 as its motion continues in'this direction the slide H strikes against the stationary stop I and the slide is forced back beneath the valve F its roll f passing up the incline i and resting upon the point e. The valve F is thus opened in advance ready to admit steam when on the return of the slide valve the port a is opened, at the other end of the chest the valve F remains open until its slide H strikes against the movable stop D when the valve F is instantly dropped and the steam is out 01f, this will take place sooner or later according to the velocity with which the engine is moving and the consequent position of the stops D, D. As the valve B continues its return motion the slide H is tripped by the stop D in a similar manner while the opposite valve F is raised by the stop I ready for another advance of the slide valve. In cut offs of this description as heretofore arranged the closing of the cut off valve has been dependent upon the velocity of motion of the slide valve, in consequence of which the out off was not instantaneous at the point required.

By means of the above described arrangement of parts, each valve is suddenly closed at the point indicated by the governor while their descent is so eased by the incline i as to prevent the noise, concussion and wear consequent upon a direct fall of the valve upon its seat.

Upon locomotives the rod O in lieu of being connected with the governor is placed under the control of the engineer by which means he is enabled to cut off steam at any alents in the manner substantially as herein desired point. set forth.

What I claim as my invention and desire "4 to secure by Letters Patent is REYNOLDD' Operating the cut ofl? valves F, F in con WVitnesses:

nection With an ordinary slide Valve by the Trros. R. RoAol-i, inclined sliding dogs H, H or their equiv- P. E. TESOHEMAOHER.

[FIRST PRINTED 1912.] 

